Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/netgraph/ng_iface.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* 2 * ng_iface.c 3 */ 4 5 /*- 6 * Copyright (c) 1996-1999 Whistle Communications, Inc. 7 * All rights reserved. 8 * 9 * Subject to the following obligations and disclaimer of warranty, use and 10 * redistribution of this software, in source or object code forms, with or 11 * without modifications are expressly permitted by Whistle Communications; 12 * provided, however, that: 13 * 1. Any and all reproductions of the source or object code must include the 14 * copyright notice above and the following disclaimer of warranties; and 15 * 2. No rights are granted, in any manner or form, to use Whistle 16 * Communications, Inc. trademarks, including the mark "WHISTLE 17 * COMMUNICATIONS" on advertising, endorsements, or otherwise except as 18 * such appears in the above copyright notice or in the software. 19 * 20 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND 21 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO 22 * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, 23 * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF 24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. 25 * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY 26 * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS 27 * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. 28 * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES 29 * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING 30 * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 31 * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR 32 * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY 36 * OF SUCH DAMAGE. 37 * 38 * Author: Archie Cobbs <archie@freebsd.org> 39 * 40 * $FreeBSD: releng/12.0/sys/netgraph/ng_iface.c 338324 2018-08-26 12:51:46Z markm $ 41 * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ 42 */ 43 44 /* 45 * This node is also a system networking interface. It has 46 * a hook for each protocol (IP, AppleTalk, etc). Packets 47 * are simply relayed between the interface and the hooks. 48 * 49 * Interfaces are named ng0, ng1, etc. New nodes take the 50 * first available interface name. 51 * 52 * This node also includes Berkeley packet filter support. 53 */ 54 55 #include "opt_inet.h" 56 #include "opt_inet6.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/errno.h> 61 #include <sys/kernel.h> 62 #include <sys/lock.h> 63 #include <sys/malloc.h> 64 #include <sys/mbuf.h> 65 #include <sys/errno.h> 66 #include <sys/proc.h> 67 #include <sys/random.h> 68 #include <sys/rmlock.h> 69 #include <sys/sockio.h> 70 #include <sys/socket.h> 71 #include <sys/syslog.h> 72 #include <sys/libkern.h> 73 74 #include <net/if.h> 75 #include <net/if_var.h> 76 #include <net/if_types.h> 77 #include <net/bpf.h> 78 #include <net/netisr.h> 79 #include <net/route.h> 80 #include <net/vnet.h> 81 82 #include <netinet/in.h> 83 84 #include <netgraph/ng_message.h> 85 #include <netgraph/netgraph.h> 86 #include <netgraph/ng_parse.h> 87 #include <netgraph/ng_iface.h> 88 89 #ifdef NG_SEPARATE_MALLOC 90 static MALLOC_DEFINE(M_NETGRAPH_IFACE, "netgraph_iface", "netgraph iface node"); 91 #else 92 #define M_NETGRAPH_IFACE M_NETGRAPH 93 #endif 94 95 /* This struct describes one address family */ 96 struct iffam { 97 sa_family_t family; /* Address family */ 98 const char *hookname; /* Name for hook */ 99 }; 100 typedef const struct iffam *iffam_p; 101 102 /* List of address families supported by our interface */ 103 const static struct iffam gFamilies[] = { 104 { AF_INET, NG_IFACE_HOOK_INET }, 105 { AF_INET6, NG_IFACE_HOOK_INET6 }, 106 { AF_ATM, NG_IFACE_HOOK_ATM }, 107 { AF_NATM, NG_IFACE_HOOK_NATM }, 108 }; 109 #define NUM_FAMILIES nitems(gFamilies) 110 111 /* Node private data */ 112 struct ng_iface_private { 113 struct ifnet *ifp; /* Our interface */ 114 int unit; /* Interface unit number */ 115 node_p node; /* Our netgraph node */ 116 hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ 117 struct rmlock lock; /* Protect private data changes */ 118 }; 119 typedef struct ng_iface_private *priv_p; 120 121 #define PRIV_RLOCK(priv, t) rm_rlock(&priv->lock, t) 122 #define PRIV_RUNLOCK(priv, t) rm_runlock(&priv->lock, t) 123 #define PRIV_WLOCK(priv) rm_wlock(&priv->lock) 124 #define PRIV_WUNLOCK(priv) rm_wunlock(&priv->lock) 125 126 /* Interface methods */ 127 static void ng_iface_start(struct ifnet *ifp); 128 static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); 129 static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, 130 const struct sockaddr *dst, struct route *ro); 131 static void ng_iface_bpftap(struct ifnet *ifp, 132 struct mbuf *m, sa_family_t family); 133 static int ng_iface_send(struct ifnet *ifp, struct mbuf *m, 134 sa_family_t sa); 135 #ifdef DEBUG 136 static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); 137 #endif 138 139 /* Netgraph methods */ 140 static int ng_iface_mod_event(module_t, int, void *); 141 static ng_constructor_t ng_iface_constructor; 142 static ng_rcvmsg_t ng_iface_rcvmsg; 143 static ng_shutdown_t ng_iface_shutdown; 144 static ng_newhook_t ng_iface_newhook; 145 static ng_rcvdata_t ng_iface_rcvdata; 146 static ng_disconnect_t ng_iface_disconnect; 147 148 /* Helper stuff */ 149 static iffam_p get_iffam_from_af(sa_family_t family); 150 static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); 151 static iffam_p get_iffam_from_name(const char *name); 152 static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); 153 154 /* List of commands and how to convert arguments to/from ASCII */ 155 static const struct ng_cmdlist ng_iface_cmds[] = { 156 { 157 NGM_IFACE_COOKIE, 158 NGM_IFACE_GET_IFNAME, 159 "getifname", 160 NULL, 161 &ng_parse_string_type 162 }, 163 { 164 NGM_IFACE_COOKIE, 165 NGM_IFACE_POINT2POINT, 166 "point2point", 167 NULL, 168 NULL 169 }, 170 { 171 NGM_IFACE_COOKIE, 172 NGM_IFACE_BROADCAST, 173 "broadcast", 174 NULL, 175 NULL 176 }, 177 { 178 NGM_IFACE_COOKIE, 179 NGM_IFACE_GET_IFINDEX, 180 "getifindex", 181 NULL, 182 &ng_parse_uint32_type 183 }, 184 { 0 } 185 }; 186 187 /* Node type descriptor */ 188 static struct ng_type typestruct = { 189 .version = NG_ABI_VERSION, 190 .name = NG_IFACE_NODE_TYPE, 191 .mod_event = ng_iface_mod_event, 192 .constructor = ng_iface_constructor, 193 .rcvmsg = ng_iface_rcvmsg, 194 .shutdown = ng_iface_shutdown, 195 .newhook = ng_iface_newhook, 196 .rcvdata = ng_iface_rcvdata, 197 .disconnect = ng_iface_disconnect, 198 .cmdlist = ng_iface_cmds, 199 }; 200 NETGRAPH_INIT(iface, &typestruct); 201 202 VNET_DEFINE_STATIC(struct unrhdr *, ng_iface_unit); 203 #define V_ng_iface_unit VNET(ng_iface_unit) 204 205 /************************************************************************ 206 HELPER STUFF 207 ************************************************************************/ 208 209 /* 210 * Get the family descriptor from the family ID 211 */ 212 static __inline iffam_p 213 get_iffam_from_af(sa_family_t family) 214 { 215 iffam_p iffam; 216 int k; 217 218 for (k = 0; k < NUM_FAMILIES; k++) { 219 iffam = &gFamilies[k]; 220 if (iffam->family == family) 221 return (iffam); 222 } 223 return (NULL); 224 } 225 226 /* 227 * Get the family descriptor from the hook 228 */ 229 static __inline iffam_p 230 get_iffam_from_hook(priv_p priv, hook_p hook) 231 { 232 int k; 233 234 for (k = 0; k < NUM_FAMILIES; k++) 235 if (priv->hooks[k] == hook) 236 return (&gFamilies[k]); 237 return (NULL); 238 } 239 240 /* 241 * Get the hook from the iffam descriptor 242 */ 243 244 static __inline hook_p * 245 get_hook_from_iffam(priv_p priv, iffam_p iffam) 246 { 247 return (&priv->hooks[iffam - gFamilies]); 248 } 249 250 /* 251 * Get the iffam descriptor from the name 252 */ 253 static __inline iffam_p 254 get_iffam_from_name(const char *name) 255 { 256 iffam_p iffam; 257 int k; 258 259 for (k = 0; k < NUM_FAMILIES; k++) { 260 iffam = &gFamilies[k]; 261 if (!strcmp(iffam->hookname, name)) 262 return (iffam); 263 } 264 return (NULL); 265 } 266 267 /************************************************************************ 268 INTERFACE STUFF 269 ************************************************************************/ 270 271 /* 272 * Process an ioctl for the virtual interface 273 */ 274 static int 275 ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) 276 { 277 struct ifreq *const ifr = (struct ifreq *) data; 278 int error = 0; 279 280 #ifdef DEBUG 281 ng_iface_print_ioctl(ifp, command, data); 282 #endif 283 switch (command) { 284 285 /* These two are mostly handled at a higher layer */ 286 case SIOCSIFADDR: 287 ifp->if_flags |= IFF_UP; 288 ifp->if_drv_flags |= IFF_DRV_RUNNING; 289 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 290 break; 291 case SIOCGIFADDR: 292 break; 293 294 /* Set flags */ 295 case SIOCSIFFLAGS: 296 /* 297 * If the interface is marked up and stopped, then start it. 298 * If it is marked down and running, then stop it. 299 */ 300 if (ifr->ifr_flags & IFF_UP) { 301 if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) { 302 ifp->if_drv_flags &= ~(IFF_DRV_OACTIVE); 303 ifp->if_drv_flags |= IFF_DRV_RUNNING; 304 } 305 } else { 306 if (ifp->if_drv_flags & IFF_DRV_RUNNING) 307 ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | 308 IFF_DRV_OACTIVE); 309 } 310 break; 311 312 /* Set the interface MTU */ 313 case SIOCSIFMTU: 314 if (ifr->ifr_mtu > NG_IFACE_MTU_MAX 315 || ifr->ifr_mtu < NG_IFACE_MTU_MIN) 316 error = EINVAL; 317 else 318 ifp->if_mtu = ifr->ifr_mtu; 319 break; 320 321 /* Stuff that's not supported */ 322 case SIOCADDMULTI: 323 case SIOCDELMULTI: 324 error = 0; 325 break; 326 case SIOCSIFPHYS: 327 error = EOPNOTSUPP; 328 break; 329 330 default: 331 error = EINVAL; 332 break; 333 } 334 return (error); 335 } 336 337 /* 338 * This routine is called to deliver a packet out the interface. 339 * We simply look at the address family and relay the packet to 340 * the corresponding hook, if it exists and is connected. 341 */ 342 343 static int 344 ng_iface_output(struct ifnet *ifp, struct mbuf *m, 345 const struct sockaddr *dst, struct route *ro) 346 { 347 uint32_t af; 348 int error; 349 350 /* Check interface flags */ 351 if (!((ifp->if_flags & IFF_UP) && 352 (ifp->if_drv_flags & IFF_DRV_RUNNING))) { 353 m_freem(m); 354 return (ENETDOWN); 355 } 356 357 /* Protect from deadly infinite recursion. */ 358 error = if_tunnel_check_nesting(ifp, m, NGM_IFACE_COOKIE, 1); 359 if (error) { 360 m_freem(m); 361 return (error); 362 } 363 364 /* BPF writes need to be handled specially. */ 365 if (dst->sa_family == AF_UNSPEC) 366 bcopy(dst->sa_data, &af, sizeof(af)); 367 else 368 af = dst->sa_family; 369 370 /* Berkeley packet filter */ 371 ng_iface_bpftap(ifp, m, af); 372 373 if (ALTQ_IS_ENABLED(&ifp->if_snd)) { 374 M_PREPEND(m, sizeof(sa_family_t), M_NOWAIT); 375 if (m == NULL) { 376 if_inc_counter(ifp, IFCOUNTER_OQDROPS, 1); 377 return (ENOBUFS); 378 } 379 *(sa_family_t *)m->m_data = af; 380 error = (ifp->if_transmit)(ifp, m); 381 } else 382 error = ng_iface_send(ifp, m, af); 383 384 return (error); 385 } 386 387 /* 388 * Start method is used only when ALTQ is enabled. 389 */ 390 static void 391 ng_iface_start(struct ifnet *ifp) 392 { 393 struct mbuf *m; 394 sa_family_t sa; 395 396 KASSERT(ALTQ_IS_ENABLED(&ifp->if_snd), ("%s without ALTQ", __func__)); 397 398 for(;;) { 399 IFQ_DRV_DEQUEUE(&ifp->if_snd, m); 400 if (m == NULL) 401 break; 402 sa = *mtod(m, sa_family_t *); 403 m_adj(m, sizeof(sa_family_t)); 404 ng_iface_send(ifp, m, sa); 405 } 406 } 407 408 /* 409 * Flash a packet by the BPF (requires prepending 4 byte AF header) 410 * Note the phoney mbuf; this is OK because BPF treats it read-only. 411 */ 412 static void 413 ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) 414 { 415 KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __func__)); 416 if (bpf_peers_present(ifp->if_bpf)) { 417 int32_t family4 = (int32_t)family; 418 bpf_mtap2(ifp->if_bpf, &family4, sizeof(family4), m); 419 } 420 } 421 422 /* 423 * This routine does actual delivery of the packet into the 424 * netgraph(4). It is called from ng_iface_start() and 425 * ng_iface_output(). 426 */ 427 static int 428 ng_iface_send(struct ifnet *ifp, struct mbuf *m, sa_family_t sa) 429 { 430 struct rm_priotracker priv_tracker; 431 const priv_p priv = (priv_p) ifp->if_softc; 432 const iffam_p iffam = get_iffam_from_af(sa); 433 hook_p hook; 434 int error; 435 int len; 436 437 /* Check address family to determine hook (if known) */ 438 if (iffam == NULL) { 439 m_freem(m); 440 log(LOG_WARNING, "%s: can't handle af%d\n", ifp->if_xname, sa); 441 return (EAFNOSUPPORT); 442 } 443 444 /* Copy length before the mbuf gets invalidated. */ 445 len = m->m_pkthdr.len; 446 447 PRIV_RLOCK(priv, &priv_tracker); 448 hook = *get_hook_from_iffam(priv, iffam); 449 if (hook == NULL) { 450 NG_FREE_M(m); 451 PRIV_RUNLOCK(priv, &priv_tracker); 452 return ENETDOWN; 453 } 454 NG_HOOK_REF(hook); 455 PRIV_RUNLOCK(priv, &priv_tracker); 456 457 NG_OUTBOUND_THREAD_REF(); 458 NG_SEND_DATA_ONLY(error, hook, m); 459 NG_OUTBOUND_THREAD_UNREF(); 460 NG_HOOK_UNREF(hook); 461 462 /* Update stats. */ 463 if (error == 0) { 464 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 465 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 466 } 467 468 return (error); 469 } 470 471 #ifdef DEBUG 472 /* 473 * Display an ioctl to the virtual interface 474 */ 475 476 static void 477 ng_iface_print_ioctl(struct ifnet *ifp, int command, caddr_t data) 478 { 479 char *str; 480 481 switch (command & IOC_DIRMASK) { 482 case IOC_VOID: 483 str = "IO"; 484 break; 485 case IOC_OUT: 486 str = "IOR"; 487 break; 488 case IOC_IN: 489 str = "IOW"; 490 break; 491 case IOC_INOUT: 492 str = "IORW"; 493 break; 494 default: 495 str = "IO??"; 496 } 497 log(LOG_DEBUG, "%s: %s('%c', %d, char[%d])\n", 498 ifp->if_xname, 499 str, 500 IOCGROUP(command), 501 command & 0xff, 502 IOCPARM_LEN(command)); 503 } 504 #endif /* DEBUG */ 505 506 /************************************************************************ 507 NETGRAPH NODE STUFF 508 ************************************************************************/ 509 510 /* 511 * Constructor for a node 512 */ 513 static int 514 ng_iface_constructor(node_p node) 515 { 516 struct ifnet *ifp; 517 priv_p priv; 518 519 /* Allocate node and interface private structures */ 520 priv = malloc(sizeof(*priv), M_NETGRAPH_IFACE, M_WAITOK | M_ZERO); 521 ifp = if_alloc(IFT_PROPVIRTUAL); 522 if (ifp == NULL) { 523 free(priv, M_NETGRAPH_IFACE); 524 return (ENOMEM); 525 } 526 527 rm_init(&priv->lock, "ng_iface private rmlock"); 528 529 /* Link them together */ 530 ifp->if_softc = priv; 531 priv->ifp = ifp; 532 533 /* Get an interface unit number */ 534 priv->unit = alloc_unr(V_ng_iface_unit); 535 536 /* Link together node and private info */ 537 NG_NODE_SET_PRIVATE(node, priv); 538 priv->node = node; 539 540 /* Initialize interface structure */ 541 if_initname(ifp, NG_IFACE_IFACE_NAME, priv->unit); 542 ifp->if_output = ng_iface_output; 543 ifp->if_start = ng_iface_start; 544 ifp->if_ioctl = ng_iface_ioctl; 545 ifp->if_mtu = NG_IFACE_MTU_DEFAULT; 546 ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); 547 ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ 548 ifp->if_addrlen = 0; /* XXX */ 549 ifp->if_hdrlen = 0; /* XXX */ 550 ifp->if_baudrate = 64000; /* XXX */ 551 IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen); 552 ifp->if_snd.ifq_drv_maxlen = ifqmaxlen; 553 IFQ_SET_READY(&ifp->if_snd); 554 555 /* Give this node the same name as the interface (if possible) */ 556 if (ng_name_node(node, ifp->if_xname) != 0) 557 log(LOG_WARNING, "%s: can't acquire netgraph name\n", 558 ifp->if_xname); 559 560 /* Attach the interface */ 561 if_attach(ifp); 562 bpfattach(ifp, DLT_NULL, sizeof(u_int32_t)); 563 564 /* Done */ 565 return (0); 566 } 567 568 /* 569 * Give our ok for a hook to be added 570 */ 571 static int 572 ng_iface_newhook(node_p node, hook_p hook, const char *name) 573 { 574 const iffam_p iffam = get_iffam_from_name(name); 575 const priv_p priv = NG_NODE_PRIVATE(node); 576 hook_p *hookptr; 577 578 if (iffam == NULL) 579 return (EPFNOSUPPORT); 580 PRIV_WLOCK(priv); 581 hookptr = get_hook_from_iffam(priv, iffam); 582 if (*hookptr != NULL) { 583 PRIV_WUNLOCK(priv); 584 return (EISCONN); 585 } 586 *hookptr = hook; 587 NG_HOOK_HI_STACK(hook); 588 NG_HOOK_SET_TO_INBOUND(hook); 589 PRIV_WUNLOCK(priv); 590 return (0); 591 } 592 593 /* 594 * Receive a control message 595 */ 596 static int 597 ng_iface_rcvmsg(node_p node, item_p item, hook_p lasthook) 598 { 599 const priv_p priv = NG_NODE_PRIVATE(node); 600 struct ifnet *const ifp = priv->ifp; 601 struct ng_mesg *resp = NULL; 602 int error = 0; 603 struct ng_mesg *msg; 604 605 NGI_GET_MSG(item, msg); 606 switch (msg->header.typecookie) { 607 case NGM_IFACE_COOKIE: 608 switch (msg->header.cmd) { 609 case NGM_IFACE_GET_IFNAME: 610 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT); 611 if (resp == NULL) { 612 error = ENOMEM; 613 break; 614 } 615 strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); 616 break; 617 618 case NGM_IFACE_POINT2POINT: 619 case NGM_IFACE_BROADCAST: 620 { 621 622 /* Deny request if interface is UP */ 623 if ((ifp->if_flags & IFF_UP) != 0) 624 return (EBUSY); 625 626 /* Change flags */ 627 switch (msg->header.cmd) { 628 case NGM_IFACE_POINT2POINT: 629 ifp->if_flags |= IFF_POINTOPOINT; 630 ifp->if_flags &= ~IFF_BROADCAST; 631 break; 632 case NGM_IFACE_BROADCAST: 633 ifp->if_flags &= ~IFF_POINTOPOINT; 634 ifp->if_flags |= IFF_BROADCAST; 635 break; 636 } 637 break; 638 } 639 640 case NGM_IFACE_GET_IFINDEX: 641 NG_MKRESPONSE(resp, msg, sizeof(uint32_t), M_NOWAIT); 642 if (resp == NULL) { 643 error = ENOMEM; 644 break; 645 } 646 *((uint32_t *)resp->data) = priv->ifp->if_index; 647 break; 648 649 default: 650 error = EINVAL; 651 break; 652 } 653 break; 654 case NGM_FLOW_COOKIE: 655 switch (msg->header.cmd) { 656 case NGM_LINK_IS_UP: 657 if_link_state_change(ifp, LINK_STATE_UP); 658 break; 659 case NGM_LINK_IS_DOWN: 660 if_link_state_change(ifp, LINK_STATE_DOWN); 661 break; 662 default: 663 break; 664 } 665 break; 666 default: 667 error = EINVAL; 668 break; 669 } 670 NG_RESPOND_MSG(error, node, item, resp); 671 NG_FREE_MSG(msg); 672 return (error); 673 } 674 675 /* 676 * Recive data from a hook. Pass the packet to the correct input routine. 677 */ 678 static int 679 ng_iface_rcvdata(hook_p hook, item_p item) 680 { 681 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 682 const iffam_p iffam = get_iffam_from_hook(priv, hook); 683 struct ifnet *const ifp = priv->ifp; 684 struct mbuf *m; 685 int isr; 686 687 NGI_GET_M(item, m); 688 NG_FREE_ITEM(item); 689 /* Sanity checks */ 690 KASSERT(iffam != NULL, ("%s: iffam", __func__)); 691 M_ASSERTPKTHDR(m); 692 if ((ifp->if_flags & IFF_UP) == 0) { 693 NG_FREE_M(m); 694 return (ENETDOWN); 695 } 696 697 /* Update interface stats */ 698 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 699 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 700 701 /* Note receiving interface */ 702 m->m_pkthdr.rcvif = ifp; 703 704 /* Berkeley packet filter */ 705 ng_iface_bpftap(ifp, m, iffam->family); 706 707 /* Send packet */ 708 switch (iffam->family) { 709 #ifdef INET 710 case AF_INET: 711 isr = NETISR_IP; 712 break; 713 #endif 714 #ifdef INET6 715 case AF_INET6: 716 isr = NETISR_IPV6; 717 break; 718 #endif 719 default: 720 m_freem(m); 721 return (EAFNOSUPPORT); 722 } 723 random_harvest_queue(m, sizeof(*m), RANDOM_NET_NG); 724 M_SETFIB(m, ifp->if_fib); 725 netisr_dispatch(isr, m); 726 return (0); 727 } 728 729 /* 730 * Shutdown and remove the node and its associated interface. 731 */ 732 static int 733 ng_iface_shutdown(node_p node) 734 { 735 const priv_p priv = NG_NODE_PRIVATE(node); 736 737 /* 738 * The ifnet may be in a different vnet than the netgraph node, 739 * hence we have to change the current vnet context here. 740 */ 741 CURVNET_SET_QUIET(priv->ifp->if_vnet); 742 bpfdetach(priv->ifp); 743 if_detach(priv->ifp); 744 if_free(priv->ifp); 745 CURVNET_RESTORE(); 746 priv->ifp = NULL; 747 free_unr(V_ng_iface_unit, priv->unit); 748 rm_destroy(&priv->lock); 749 free(priv, M_NETGRAPH_IFACE); 750 NG_NODE_SET_PRIVATE(node, NULL); 751 NG_NODE_UNREF(node); 752 return (0); 753 } 754 755 /* 756 * Hook disconnection. Note that we do *not* shutdown when all 757 * hooks have been disconnected. 758 */ 759 static int 760 ng_iface_disconnect(hook_p hook) 761 { 762 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); 763 const iffam_p iffam = get_iffam_from_hook(priv, hook); 764 765 if (iffam == NULL) 766 panic("%s", __func__); 767 PRIV_WLOCK(priv); 768 *get_hook_from_iffam(priv, iffam) = NULL; 769 PRIV_WUNLOCK(priv); 770 return (0); 771 } 772 773 /* 774 * Handle loading and unloading for this node type. 775 */ 776 static int 777 ng_iface_mod_event(module_t mod, int event, void *data) 778 { 779 int error = 0; 780 781 switch (event) { 782 case MOD_LOAD: 783 case MOD_UNLOAD: 784 break; 785 default: 786 error = EOPNOTSUPP; 787 break; 788 } 789 return (error); 790 } 791 792 static void 793 vnet_ng_iface_init(const void *unused) 794 { 795 796 V_ng_iface_unit = new_unrhdr(0, 0xffff, NULL); 797 } 798 VNET_SYSINIT(vnet_ng_iface_init, SI_SUB_PSEUDO, SI_ORDER_ANY, 799 vnet_ng_iface_init, NULL); 800 801 static void 802 vnet_ng_iface_uninit(const void *unused) 803 { 804 805 delete_unrhdr(V_ng_iface_unit); 806 } 807 VNET_SYSUNINIT(vnet_ng_iface_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY, 808 vnet_ng_iface_uninit, NULL);
Cache object: ee7feddcf56cdbc0feae351ffef5db1a
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]